[ARM] Implement widening and narrowing integer moves, vmovl, vqmovn.

test/cctest/test-disasm-arm.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 915 matching lines @@
 
 TEST(Neon) {
   SET_UP();
 
   if (CpuFeatures::IsSupported(NEON)) {
     CpuFeatureScope scope(&assm, NEON);
       COMPARE(vld1(Neon8, NeonListOperand(d4, 4), NeonMemOperand(r1)),
               "f421420f       vld1.8 {d4, d5, d6, d7}, [r1]");
       COMPARE(vst1(Neon16, NeonListOperand(d17, 4), NeonMemOperand(r9)),
               "f449124f       vst1.16 {d17, d18, d19, d20}, [r9]");
-      COMPARE(vmovl(NeonU8, q3, d1),
-              "f3886a11       vmovl.u8 q3, d1");
-      COMPARE(vmovl(NeonU8, q4, d2),
-              "f3888a12       vmovl.u8 q4, d2");
+      COMPARE(vmovl(NeonU8, q3, d1), "f3886a11       vmovl.u8 q3, d1");
+      COMPARE(vmovl(NeonU8, q4, d2), "f3888a12       vmovl.u8 q4, d2");
+      COMPARE(vmovl(NeonS16, q4, d2), "f2908a12       vmovl.s16 q4, d2");
+      COMPARE(vmovl(NeonU32, q4, d2), "f3a08a12       vmovl.u32 q4, d2");
+
+      COMPARE(vqmovn(NeonU8, d16, q8), "f3f202e0       vqmovn.u16 d16, q8");

[martyn.capewell, 2017/03/27 13:19:43]

It seems confusing that vqmovn(NeonU8...) disassembles to vqmovn.u16. I notice
the comment in the assembler header file, so I guess it's consistent.

[bbudge, 2017/03/27 17:48:02]

Otherwise, I'd need to extend the NeonDataType enum, which seems like it might
be disruptive.

+      COMPARE(vqmovn(NeonS16, d16, q8), "f3f602a0       vqmovn.s32 d16, q8");
+      COMPARE(vqmovn(NeonU32, d2, q4), "f3ba22c8       vqmovn.u64 d2, q4");
 
       COMPARE(vmov(NeonS8, d0, 0, r0), "ee400b10       vmov.8 d0[0], r0");
       COMPARE(vmov(NeonU8, d1, 1, r1), "ee411b30       vmov.8 d1[1], r1");
       COMPARE(vmov(NeonS8, d2, 2, r2), "ee422b50       vmov.8 d2[2], r2");
       COMPARE(vmov(NeonU8, d3, 3, r8), "ee438b70       vmov.8 d3[3], r8");
       COMPARE(vmov(NeonS8, d4, 4, r0), "ee640b10       vmov.8 d4[4], r0");
       COMPARE(vmov(NeonU8, d5, 5, r1), "ee651b30       vmov.8 d5[5], r1");
       COMPARE(vmov(NeonS8, d6, 6, r2), "ee662b50       vmov.8 d6[6], r2");
       COMPARE(vmov(NeonU8, d7, 7, r8), "ee678b70       vmov.8 d7[7], r8");
       COMPARE(vmov(NeonS16, d0, 0, r0), "ee000b30       vmov.16 d0[0], r0");
@@ skipping 495 matching lines @@
 
   COMPARE(ldrexb(r0, r1), "e1d10f9f       ldrexb r0, [r1]");
   COMPARE(strexb(r0, r1, r2), "e1c20f91       strexb r0, r1, [r2]");
   COMPARE(ldrexh(r0, r1), "e1f10f9f       ldrexh r0, [r1]");
   COMPARE(strexh(r0, r1, r2), "e1e20f91       strexh r0, r1, [r2]");
   COMPARE(ldrex(r0, r1), "e1910f9f       ldrex r0, [r1]");
   COMPARE(strex(r0, r1, r2), "e1820f91       strex r0, r1, [r2]");
 
   VERIFY_RUN();
 }